Package base



FIG. 1 is a perspective view of the bottom of the package base;

FIG. 2 is a perspective view of the top of the package base;

FIG. 3 is a bottom view of the package base;

FIG. 4 is a top view of the package base; and,

FIGS. 5-8 are side views of the package base.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a package base, as shown and described. 